| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef URL_URL_FILE_H_ |
| #define URL_URL_FILE_H_ |
| |
| // Provides shared functions used by the internals of the parser and |
| // canonicalizer for file URLs. Do not use outside of these modules. |
| |
| #include "base/strings/string_util.h" |
| #include "url/url_parse_internal.h" |
| |
| namespace url { |
| |
| // We allow both "c:" and "c|" as drive identifiers. |
| inline bool IsWindowsDriveSeparator(char16_t ch) { |
| return ch == ':' || ch == '|'; |
| } |
| |
| // Returns the index of the next slash in the input after the given index, or |
| // spec_len if the end of the input is reached. |
| template<typename CHAR> |
| inline int FindNextSlash(const CHAR* spec, int begin_index, int spec_len) { |
| int idx = begin_index; |
| while (idx < spec_len && !IsURLSlash(spec[idx])) |
| idx++; |
| return idx; |
| } |
| |
| // DoesContainWindowsDriveSpecUntil returns the least number between |
| // start_offset and max_offset such that the spec has a valid drive |
| // specification starting at that offset. Otherwise it returns -1. This function |
| // gracefully handles, by returning -1, start_offset values that are equal to or |
| // larger than the spec_len, and caps max_offset appropriately to simplify |
| // callers. max_offset must be at least start_offset. |
| template <typename CHAR> |
| inline int DoesContainWindowsDriveSpecUntil(const CHAR* spec, |
| int start_offset, |
| int max_offset, |
| int spec_len) { |
| CHECK_LE(start_offset, max_offset); |
| if (start_offset > spec_len - 2) |
| return -1; // Not enough room. |
| if (max_offset > spec_len - 2) |
| max_offset = spec_len - 2; |
| for (int offset = start_offset; offset <= max_offset; ++offset) { |
| if (!base::IsAsciiAlpha(spec[offset])) |
| continue; // Doesn't contain a valid drive letter. |
| if (!IsWindowsDriveSeparator(spec[offset + 1])) |
| continue; // Isn't followed with a drive separator. |
| return offset; |
| } |
| return -1; |
| } |
| |
| // Returns true if the start_offset in the given spec looks like it begins a |
| // drive spec, for example "c:". This function explicitly handles start_offset |
| // values that are equal to or larger than the spec_len to simplify callers. |
| // |
| // If this returns true, the spec is guaranteed to have a valid drive letter |
| // plus a drive letter separator (a colon or a pipe) starting at |start_offset|. |
| template <typename CHAR> |
| inline bool DoesBeginWindowsDriveSpec(const CHAR* spec, |
| int start_offset, |
| int spec_len) { |
| return DoesContainWindowsDriveSpecUntil(spec, start_offset, start_offset, |
| spec_len) == start_offset; |
| } |
| |
| #ifdef WIN32 |
| |
| // Returns true if the start_offset in the given text looks like it begins a |
| // UNC path, for example "\\". This function explicitly handles start_offset |
| // values that are equal to or larger than the spec_len to simplify callers. |
| // |
| // When strict_slashes is set, this function will only accept backslashes as is |
| // standard for Windows. Otherwise, it will accept forward slashes as well |
| // which we use for a lot of URL handling. |
| template<typename CHAR> |
| inline bool DoesBeginUNCPath(const CHAR* text, |
| int start_offset, |
| int len, |
| bool strict_slashes) { |
| int remaining_len = len - start_offset; |
| if (remaining_len < 2) |
| return false; |
| |
| if (strict_slashes) |
| return text[start_offset] == '\\' && text[start_offset + 1] == '\\'; |
| return IsURLSlash(text[start_offset]) && IsURLSlash(text[start_offset + 1]); |
| } |
| |
| #endif // WIN32 |
| |
| } // namespace url |
| |
| #endif // URL_URL_FILE_H_ |